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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {Cc,Ci,components} = require("chrome");
// Undo the auto-parentification of URLs done in bug 418356.
function deParentifyURL(url) {
return url ? url.split(" -> ").slice(-1)[0] : url;
}
// TODO: We might want to move this function to url or some similar
// module.
function getLocalFile(path) {
var ios = Cc['@mozilla.org/network/io-service;1']
.getService(Ci.nsIIOService);
var channel = ios.newChannel(path, null, null);
var iStream = channel.open();
var siStream = Cc['@mozilla.org/scriptableinputstream;1']
.createInstance(Ci.nsIScriptableInputStream);
siStream.init(iStream);
var data = new String();
data += siStream.read(-1);
siStream.close();
iStream.close();
return data;
}
function safeGetFileLine(path, line) {
try {
var scheme = require("./url").URL(path).scheme;
// TODO: There should be an easier, more accurate way to figure out
// what's the case here.
if (!(scheme == "http" || scheme == "https"))
return getLocalFile(path).split("\n")[line - 1];
} catch (e) {}
return null;
}
function errorStackToJSON(stack) {
var lines = stack.split("\n");
var frames = [];
lines.forEach(
function(line) {
if (!line)
return;
var atIndex = line.indexOf("@");
var colonIndex = line.lastIndexOf(":");
var filename = deParentifyURL(line.slice(atIndex + 1, colonIndex));
var lineNo = parseInt(line.slice(colonIndex + 1));
var funcSig = line.slice(0, atIndex);
var funcName = funcSig.slice(0, funcSig.indexOf("("));
frames.unshift({filename: filename,
funcName: funcName,
lineNo: lineNo});
});
return frames;
};
function nsIStackFramesToJSON(frame) {
var stack = [];
while (frame) {
if (frame.filename) {
var filename = deParentifyURL(frame.filename);
stack.splice(0, 0, {filename: filename,
lineNo: frame.lineNumber,
funcName: frame.name});
}
frame = frame.caller;
}
return stack;
};
var fromException = exports.fromException = function fromException(e) {
if (e instanceof Ci.nsIException)
return nsIStackFramesToJSON(e.location);
if (e.stack && e.stack.length)
return errorStackToJSON(e.stack);
if (e.fileName && typeof(e.lineNumber == "number"))
return [{filename: deParentifyURL(e.fileName),
lineNo: e.lineNumber,
funcName: null}];
return [];
};
var get = exports.get = function get() {
return nsIStackFramesToJSON(components.stack.caller);
};
var format = exports.format = function format(tbOrException) {
if (tbOrException === undefined) {
tbOrException = get();
tbOrException.splice(-1, 1);
}
var tb;
if (typeof(tbOrException) == "object" &&
tbOrException.constructor.name == "Array")
tb = tbOrException;
else
tb = fromException(tbOrException);
var lines = ["Traceback (most recent call last):"];
tb.forEach(
function(frame) {
if (!(frame.filename || frame.lineNo || frame.funcName))
return;
lines.push(' File "' + frame.filename + '", line ' +
frame.lineNo + ', in ' + frame.funcName);
var sourceLine = safeGetFileLine(frame.filename, frame.lineNo);
if (sourceLine)
lines.push(' ' + sourceLine.trim());
});
return lines.join("\n");
};
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